The answer to the greatest mystery - Who came first : Chicken or Egg?

A chicken and an egg are lying in bed. The chicken is leaning against

the headboard smoking a cigarette, with a satisfied smile on its face. The

egg, looking a bit pissed off, grabs the sheet, rolls over, and says,

"Well, I guess we finally answered THAT question."

If anyone needs it explained - read it a second time